We bought one of those about 13 years ago used. It was a bit more than $65, like over $100. I plugged Jolene's guitar and vocal mic in it and I used my tube amp for vocals and a small SS amp for harp. It was not ideal but it worked for a while.
Are you going to sing through one side and try harp in the other? The EQ features were ok. ----------
I just started building a cabinet for it. A 15", a 12" and (2) 8"s. Plug a 57 and pedals in the instrument side and a 58 in the mic side for acoustic playing? That's just 1 possibility. I don't know what I'm going to do with it.
Delta 210s are starting to pop up on Craigslist, but they're still asking about $375. I had to let a couple of those get away.
I had a Delta Blues 210 for a while. Nice amp. $350 10 years ago so they have gone up with demand I guess.
I'm happy with small- 12w single 12, tremolo- Princeton clone, Silvertone 1482. I see they have upped in value in the past few years as well.
If you have a Shaker dynamic mic that could go well in a solid state I think. It's medium impedance. A pedal or two in the chain you may have a very cool rig! ----------
The Shaker is very clean. I got the IMT cable from Joe at Shaker and it upped the volume. I can dirty it some with a delay pedal or run it clean for more folk and rock stuff.
I don't know what you'd need on a bass harp, never tried one. Paul Oscher is handy with one, he may have some input. ----------