If you spun a bearing, you need to have crankshaft checked before you buy bearings. Chances are that the journal will require turning (machined down to smooth). If so, all the rod journals will need turning, and you will need to buy oversize bearings. They usually come in 0.15, 0.30 and 0.60 oversize. The machine shop that turns the crank will tell you what they turned it to, and what thickness of bearings to buy. Hopefully the crank isn't damaged too bad to have machined.
I used to use Summit Racing (
www.summitracing.com) for parts. They usually had parts for my 396's and 427's, as well as parts for the 4.3L chevy engines that were in my pick-up and Astro van. Haven't rebuilt an engine in probably 10 years, but Summit is still in business, and was usually very competitive on prices.
Good luck!