About 8 years ago I bought – 
Electric guitar Washburn wi200pro for about 546 dollars
Amplifier Marshall mg30dfx for about 327 dollars after discount (without a discount it cost about 436 dollars)

After I bought the guitar and the amp I played them for about a year only at home and after that I stopped playing (didn't touch them for about 7 years).
The guitar has some fret buzz (never had a setup) and both the guitar and the amp have some rusty bolts but other than that I think they are in pretty good shape.
I want to sell them and would like to know an estimate on how much they are worth today.