I crossed my fingers and placed an order for a lycra bike outfit...super-cheap and shipped from China...you have to pre-pay for items shipped from outside Thailand, but The Web Store guarantees there are no hidden taxes and/or import duties.
Within the estimated delivery time, the item was delivered to my door! It was exactly as advertised, and there were zero extra charges. The quality seems very good , and I can scarcely believe my good fortune at being able to acquire such an outfit for 611 baht [about $US20].
So, I now buy with confidence, and have yet to be ripped off.
My latest acquisition was a set of aerobars...650baht [about US$22]. I had a bit of difficulty in fitting them, and did a little bit of damage to the bar attachment clamp. However, they are now firmly fixed on my MTB, and...surprise...give me about 4kph extra speed, and greater endurance as they offer an opportunity to rest on the forearms and so relax the hands.
Here is a snap of me, showing off Lycra outfit and aerobars: