There are more choices but not necessarily cheaper (especially GBP exchange rate is so high now...). You might get a bargain when they are on promotion. The most expensive models or the cheapest ones are not sold in HK. Most of the models are more bulky than Japanese design, not ideal for use in HK transport. If I could, I would have taken a Combi with me when I came back from HK this summer!
I see... Graco and Britax are more popular here and certainly more choices as well. You can have a look on their websites to see if you like their design. For the prices, don't expect them to be very cheap as explained in my previous message, but you can check on Mothercare, toysrus, kiddicare to find out.