I recently went back to a reflector and needed a new laser collimator and, while browsing, came across this:
For just £19.99 I thought it was worth a punt, and I'm happy to say it's well worth the money. It can be collimated via three grub screws hidden under silicone, and has adjustable brightness. Mine was only a fraction out on testing, and most likely due to shipping.
If you couple it with a Revelation 2" Self Centering Adaptor then you effectively have a 2" Hotech at around 1/3 the price:
Both items are still £20 cheaper than a Baader Laser Collimator, so it can't be bad really can it!
I agree that Seben scopes aren't up to much, but the collimator is a different story.