I agree with blacknight, Realex supports laser and they have an Add-on for osCommerce for doing remote authorisation against their Gateway. However, as this post demonstrates, it may not always be plain sailing to get it working...
I am currently setting up a store using OS Commerce and Realex as the gateway. Their module was dead easy to install. I just updated the pages they included, installed the payments module and entered the merchant ID and shared secret.
I am still in test mode, and just checked that a laser card was processed with no problems.
@KevinG, that post is over a year old, so it looks like they have corrected the problem since.