They had mailing List with list flyers. I remember them from Rec.Games.Video.Classic Boards . Like Jerry G and others.
Like this 1999 post
J.F.S.
4/6/99
We own 1,000,000 Atari 2600/7800 videogames, all games are new and in mint
condition with over 40 titles cost is $.80 each + shipping we accept
Mastercard and Visa, our site is www.oshealtd.com
Thank You
O'Shea, Ltd.