Tail bags ?

Needing to transport some items on the s3, I was drawn to the ogio stealth tail bag.
What particularly appealed was the snap connectors so I could easily detach the bag without removing the seat. (I had planned to mount it by strapping under the rear seat).
Unfortunately no one in the UK seems to have one left for sensible money, and importing from the USA adds to the cost.
Does anyone know of a suitable alternative that uses the snap connectors up to my £60 budget ?

 

Cheers Guys, I went for a Held as it looked to be pretty decent and the right size for what I wanted.
Not got the pockets that the Ogio has, but was cheaper. Hopefully it will be a decent purchase
The Kriega's don't look to have the snap connectors that I could see ?
@ Roadrider, for newer models maybe, but mine is a 2000 model.