Sega Megadrive games

How much are these worth untested? Also, if anyone knows if I could mod a genesis model 2 to play these, that would be greatly appreciated.

 

They are Sega Master System games!

Nothing to uncommon there but some good games, if they are complete with manuals approx £30-£40 the lot.

They are not playable on a Mega Drive without a converter.

 

oh, they are master system! Because they said "Mega Cartridge" I assumed they were mega drive. Thanks for clarification, I don't really collect or play for the sega consoles, so I really have no idea about these.

 

Those are all pretty common so you're looking at $10-$30 each providing they are complete.

You can get one of these to play them on a genesis/mega drive
http://segaretro.org/Power_Base_Converter
http://www.stoneagegamer.com/powerbase-mini.html < this one won't play ghost house

You could also consider getting a Master System. I got mine a year back and love it (never had one growing up). =)