I have a new pair of rats, they do love each others company! Check the nfrs website for breeders and rescues information as a few breeders I contacted had older rays that needed new homes as well as babies to sell.
Mine love peanut butter and pistachios. One of them loves yoghurt too but neither like yoghurt drops made for rats. Shreddies are a firm favourite already for both and that's how we bribe them out of their cage for cuddles.
One thing I've learnt so far (apart from how to get a baby rat back from under a fridge ) is not to put a heavy house down unless you can pick it up. One of my rats will house in this huge wooden monstrosity when he is feeling antisocial or is shocked/potentially injured. It is a nightmare to try get him out to check he is okay. It usually involves ten minutes of bribing followed by ten minutes of making him jealous by making a fuss of his brother