I'm using the Bentley from Gardiners too, Blowed if I know how Squeaks has battered his so quickly, mine has been in use day after day constantly since Valentines day, it is starting to wear of course, but there is at another 3 months work left in it, maybe more.
If I am going to replace a brush or anything else for that matter, then I'll also buy other things too, thereby reducing the effect of the delivery charge.
I might go down the DIY route, but only for the minor curiosity of knocking one up for myself.
You will still have to buy the jets though, I don't think Dave mentioned those did he?
So you will have to send off for those
Unless they sell them at aquarium shops??
Personally I think it is a small price to pay anyway, I'd sooner order a brush and use it straight from the box!
Ian