2D Game Engine

Giderious Studio - (language: Lua)

• Android In-App Billing
• iOS In-App Purchase
• iAd - Monetize Module for iOS
• Flurry - Monetize Module crossplatform

Unity2D - (language: Js, C#, Boo)

• Android In-App Billing : youtube
• iOS In-App Purchase: youtube
• Monetize

Adobe Game SDK - (language: ActionScript)

• Android In-App Billing 
• iOS In-App Purchase
• Admob
• Developement In Action

Loom SDK

• Android In-App Billing & iOS In-App Purchase
• Admob
• Youtube channel

Corona SDK - (language: Lua)

• Android In-App Billing & iOS In-App Purchase
• Admob : sample

SaladGame - (no programming skill required)

• iOS In-App Purchase
• In-App Billing (not available)
• Mobclix - monetize module

COLT JS - (language: Js)

• Developement In Action

Extra:

• Soomla - provide solution for develope to work with virtual goods on the most great 2D game engine like Unity and Cocos2Dx.
• 42 way to monetize your app
• 10 unity monetize plugin

*Please let me know your suggestion. Thanks.