The site has still has prices in Lats (LVL), pages are not updated since long long time ago, but in any case it stays as it is as a nice souvenir to old times.
Rimi is a big supermarket shop that has a large verity of food products.
Basically everything is there: meat, salads, bread, drinks (all types including alcohol), cheese, sausages, fruits and vegetables and frozen food. Prices are cheap and reasonable.
More locations of Rimi here: http://www.rimi.lv/veikali/rimi-lielveikali