Both Gemm and Musicstack has many albums listed. Here is the URL to the Gemm listings:
http://www.gemm.com/c/search.pl?currency=US&filt_skip=1&search_detailed=1&artist=Mose+Allison&title=&media=VINYL&a_country_radio=ANY&a_country=&price_radio=ANY&price=&new_date_radio=ANY&new_date=&quant_on_hand=-1&condition_media=ANY&label=&release_number=&produce_remix=&category=&source_item_ref=&a_refno=&seller_country=&seller=&command=Search
http://www.gemm.com/c/search.pl?currency=US&filt_skip=1&search_detailed=1&artist=Mose+Allison&title=&media=VINYL&a_country_radio=ANY&a_country=&price_radio=ANY&price=&new_date_radio=ANY&new_date=&quant_on_hand=-1&condition_media=ANY&label=&release_number=&produce_remix=&category=&source_item_ref=&a_refno=&seller_country=&seller=&command=Search