Off hand, the only ones which pay by check are A-C-L, ACE, BDS, Harland Clarke, Informa, Service Performance Group, Service Sense, Shoppers, Sensors Quality Management (for US ICs only), Sights on Service dba Secret Shopper, Sinclair. I may be missing a few, but no big ones. There are also some that offer the option of checks rather than ACH such as Market Force and Maritz.