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If you go on eBay, set up an alert for "SRAM TT" and check the email every day. I bought a pair that were £30 buy it now. Also join some Facebook groups for selling bike parts (if you're in the UK there's one called "UK bike parts for sale or free"). If you look at the sold listings on eBay £25-£30 seems to be the best price you're going to get.
Also you could have a look at the classifieds on here, better chance of someone doing you a deal.
Yeah, it works great and considering that you can get a derailleur and shifter for <£50 (used) it's a pretty good setup.
He's routed the cable under the tape in that one. Maybe it's the weirdly shaped cables in the other bike, don't imagine they'd feel good under the bar tape