Best printer for printing postcards and thick paper/card?

I am having trouble finding a small desk top printer to print onto postcards and thick card .The printer I have an Epson stylus does not grab the card to feed it through the printer and even applying pressure is a hit and miss game resulting in misplaced print etc.They have to be available in the UK and can be black and white only as we only print text onto preprinted cards.It is for a charity to print thankyou cards so the cheaper the better but reliability and longevity is also needed Thanks in advance for your help