most online shops will be within a few dollars of each other on all those items. if you want to save a few bucks look for one that cuts you a break on shipping. Frankly, I only deal with a very few retailers and that is because they have given excellent service. I would rather spend a buck or two more on an item and get great service than have to wait weeks while someone has to get it in stock then ship it to me.
Also, if you have not yet ordered your blank then the but dia. should be listed in the catalog. if .360 is too big you can always shim it with some foam arbors. I looked at a few model in the length and wt you want and they are running in the .280 area. so you would have to make up about 5/64"