Sink Source
Try a good plumbing store/shop......I found a good quality 10" S.S. round sink for my head which was around $40.00 + $20.00 for the 2" drain kit. It was a "Bar Sink" made by Elkay.
The manager let me cruise through his sink catalogues an helped me pick out a good quality one (insulated bowl to prevent condensation, large drain to prevent plugging, a rim to prevent water leaks, etc.). I walked away with a good sink at 10% of the "Marine sinks" which are an absolute rip-off.
Or try online..there are tons of plumbing outlets with sinks.
John M.