GMG Entertainment, a United States-based provider of virtual currency cards for online games, has expanded its retail partnerships to Canada and the United Kingdom.

The company is offering a selection of prepaid currency cards for online games and sites like AdventureQuest, SubaGames, and Stardoll -- the latter of which just reached 50 million users -- through "key retailers" in Canada and the UK.

Retail chain WHSmith was the only specific outlet mentioned in the announcement. In a statement, the chain's commercial development director Ian Sanders said, “We are delighted to be able to add the GMG cards to our Gift Card Shop offer. The inclusion of PC and online gaming cards will enhance the overall range and help drive further sales growth within this category.”

There has been a recent string of companies looking to make their mark in the retail-based currency card market, and that virtual gold rush is generating new approaches. A recent Zeus Research program allows its partners to sell virtual currency by way of phone cards.

“We are fortunate to begin to offer our digital partners meaningful distribution outside the United States,” said GMG CEO Rob Goldberg. “With this initiative we also offer for several partners an expanded footprint internationally and we look forward to growing our presence in several other countries in the coming months.”