for a nice HK93A2(fixed stock) I would say $1900-2100, add $300-ish if it has the A3 stock. the 93's run a few hundred more than the 91's. Anything under $1800 is a great deal IMOP.
Bipod is worth $75
Mags are spendy, so figure each will run you $40-60.
I'll say this, I LOVE my 93, took it out shootin yesterday with the Hensolt 4x28 scope(thing is 20+ years old), at 100 yards I was 1-2" groups and I am by no means a marksman, just shooting WWB as well.
so you know. the 93's used 2 different carriers, one(older) has the buffered carrier and uses a noin buffered stock. the latter models used a non buffered carrier and buffered stock.......so make sure parts are not mismatched, because a non buffered carrier and non buffered stock is NOT a good thing. now a buffered carrier and buffered stock is not as bad I don't think.
the 93's that used the buffered carrier will have the all plastic A2 stock(looks like a MP5A2 stock) the 93's that use the non buffered carriers use the metal backed A2 stock(looks more like a 91 stock)
not near the surplus parts for a 93 as a 91. also not near as many 93's sold in the US compared to the 91.
the finish on the 93 should be the blue/gray color.