I'm in the market to upgrade the poplar arms on my v-tail quad to carbon fiber tubing. I'd like square tubing, but round would do also. Each arm is around 40cm long, and right now I'm using 10mm square poplar, so I'm looking for CF around that size. HK seems like it's a decent deal, but it's a little frustrating that you need to pay for like 500g of shipping (since it needs to be packaged in a long tube). I'm in the US, are there any brick and mortar stores that actually sell the stuff? If I'm going to pay $30 from HK and wait 3 weeks to see it arrive, I wouldn't mind spending that much somewhere local (or elsewhere online).