diff --git a/app/migrations/env.py b/app/migrations/env.py
index 9c8dad1..caa838d 100644
--- a/app/migrations/env.py
+++ b/app/migrations/env.py
@@ -1,7 +1,7 @@
 # flake8: noqa
-from pathlib import Path
 import importlib
 from logging.config import fileConfig
+from pathlib import Path
 
 from alembic import context
 from sqlalchemy import engine_from_config, pool
diff --git a/app/models/static.py b/app/models/static.py
index 3a3c8d7..259167d 100644
--- a/app/models/static.py
+++ b/app/models/static.py
@@ -47,12 +47,12 @@
 
 WebURL: str = Field(
     ...,
-    pattern=r"^https?://(?:[a-zA-Z0-9-]+\.)+[a-zA-Z]{2,}(?::\d+)?" r"(?:/[^\s]*)?$",
+    pattern=r"^https?://(?:[a-zA-Z0-9-]+\.)+[a-zA-Z]{2,}(?::\d+)?"
+    r"(?:/[^\s]*)?$",
     description=(
         "A valid web URL, starting with 'http://' or 'https://'. It can "
         "include domain names, optional ports, and paths. Example: "
-        "'https://www.example.com' or 'http://example.com:8080/path'."
-    ),
+        "'https://www.example.com' or 'http://example.com:8080/path'."),
     examples=[
         "https://www.helpwave.de",
         "https://www.example.com",
diff --git a/app/models/voucher.py b/app/models/voucher.py
index 67b71c6..1aba3f3 100644
--- a/app/models/voucher.py
+++ b/app/models/voucher.py
@@ -4,8 +4,8 @@
 
 from pydantic import BaseModel
 from sqlalchemy import Column, DateTime, ForeignKey, Integer, Numeric, String, Text
-from sqlalchemy.orm import relationship
 from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import relationship
 from utils.database.connection import Base
 
 
diff --git a/app/routers/customer_product.py b/app/routers/customer_product.py
index 4c819c2..6d28e29 100644
--- a/app/routers/customer_product.py
+++ b/app/routers/customer_product.py
@@ -7,19 +7,22 @@
 from models.customer_product import (
     CustomerProduct,
     CustomerProductBase,
-    CustomerProductCreate,
     CustomerProductCalculation,
     CustomerProductCalculationRequest,
+    CustomerProductCreate,
     ExtendedCustomerProductBase,
 )
 from models.customer_product_contract import CustomerProductContract
 from models.invoice import Invoice
 from models.product import Product
-from models.product_plan import ProductPlan
 from models.product_contract import ProductContract
+from models.product_plan import ProductPlan
 from models.static import PlanTypeEnum
 from models.voucher import Voucher
-from utils.calculation.pricing import calculate_pricing_in_euro, calculate_full_pricing_in_euro
+from utils.calculation.pricing import (
+    calculate_full_pricing_in_euro,
+    calculate_pricing_in_euro,
+)
 from utils.database.session import get_database
 from utils.security.token import get_user
 
diff --git a/app/routers/product.py b/app/routers/product.py
index 9536cbd..60d0dfc 100644
--- a/app/routers/product.py
+++ b/app/routers/product.py
@@ -1,8 +1,11 @@
 from uuid import UUID
 
 from fastapi import APIRouter, Depends, HTTPException
+from models.customer_product import CustomerProduct
 from models.product import Product, ProductBase
+from models.user import User
 from utils.database.session import get_database
+from utils.security.token import get_user
 
 router = APIRouter(prefix="/product", tags=["Product"])
 
@@ -20,3 +23,20 @@ async def read(uuid: UUID, session=Depends(get_database)):
         raise HTTPException(status_code=404, detail="Product not found.")
 
     return product
+
+
+@router.get("/available/", response_model=list[ProductBase])
+async def available(user: User = Depends(get_user),
+                    session=Depends(get_database)):
+
+    if not user.customer:
+        raise HTTPException(
+            status_code=404,
+            detail="Customer not created yet.")
+
+    booked_product_uuids = session.query(CustomerProduct.product_uuid).filter(
+        CustomerProduct.customer_uuid == user.customer_uuid).subquery()
+    available_products = session.query(Product).filter(
+        ~Product.uuid.in_(booked_product_uuids)).all()
+
+    return available_products