An 80-110$ is kind of low.
You're not going to get a linear power supply for that money, one that's worth buying, and linear power supplies are much better as they have less voltage ripple and often can be adjusted more precisely (10 turn pots etc)
So you're looking at smps power supplies... and in that category there's nothing special popping out. There are some power supplies as low as $60 dollars but pretty much they're all the same, ok but not great.
There's plenty of linear power supply designs out there... you can buy a 2x18v 6-8a transformer for around 20-25$, opams, resistors, capacitors, potentiometers, transistors etc cost you about 30-40$ including the heatsink for the pass transistor(s), pcb costs you about 10-15$ if you design it yourself and send it to some pooling service... so it's a bit hard but you CAN make your own linear power supply for under 100$, that's about as good as a $150-200 one.