eBay

Ps ;  As a seller use a checking bank account just for eBay (as did I) without an overdraft so that you can close it instantly should things go bad because they do have the right to get in there anytime they want, again read fine print. 

Cheers 

eBay didn’t charge a fee on shipping and the last time I bought something, they didn’t charge me a fee on the tax.

in the past, you would see a widget for sale on the cheap but the shipping was 10x more than what it actually cost to ship.

@8th-note  nailed it btw....

Paying around 15% or so to achieve an honest auction value for an item is a much better alternative in my experience.  

At the end of any day, eBay is a 24/7/365.25 auction at its' core.

As is Audio Mart, and the plethora of others for that which boats your float...;)

And shipping frequently becomes Your Problem.

15% is the price of admission to their vast buying audience and site logistics.  Seems fair enough to me.  I have bought and sold a lot of Tubes (best site to sell on) , CD’s and LP’s  with great success on eBay.  Higher priced items like components I sell on another site to avoid the high fees.  

OP, have you talked to eBay?