Star Trek Online is available to download for $2.50 on Amazon.com.
Yes; it is download only and available only to US residents; however, if you put it in your basket and then change your address to add a random US state from the dropdown options then you are able to buy it. I also had to re-add a credit card (debit card does not work) and voila!
The Deluxe version is also available to download for $5.
NOTE: This game requires a monthly fee so you are getting 30 days play for ~£1.63. Apparently, you might be able to order a copy of each (deluxe and standard) and then combine the gaming time on one account but buying multiple copies of the same will not let you stack. I haven't tried this yet.