Pedu's thought is based on supply and demand....
Basically, the !Arcade! adapter has now been released in wide distribution. With this release, that means there should a surge in demand for MVS carts. That also could mean that the demand for home carts could go down, hence dropping prices.
BUT, !Arcade! has another product in the pipeline right now that would void that whole arguement, the system currently dubbed the 'AES2.' This will be a Neo system based around home carts from what I know (if anyone has more info, please add). So, once again, when people pick this syetm up, the demand for home carts will rise once again.
So, from the babbling I did above, I believe we might see a brief dip in home cart prices, but we will see a slight rise in price of MVS carts as there will be a larger demand for them!
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Keith