I've always wanted to have Ubuntu merchandise, and the prices for the products themselves are very much affordable. However, the issue is Shipping. I'm from the United States and since the shipping is coming air-mail from the UK to the US, the shipping has always (for me at least) at least doubled the cost of the purchase.
For example, a Sub-Total of £10.25 (an Ubuntu t-shirt) is $17.00 US Dollar USD; affordable and reasonable for a t-shirt. However, that £10.25 has a £20.50 shipping fee, or $35.00 USD. That over triples the cost, which, for me, isn't affordable (the total being $52 USD.)