When I bought my latest TV (1 or 2 years ago) had similar experience. Fortress was a bit more expensive but you would get some cash vouchers and another appliance (that I wanted to buy anyway) so overall I came out cheaper by buying from Fortress (difference was I think the 1k Wellcome coupons)
Some of the price.com.hk retailers indeed advertise with cheaper pricing but it comes with conditions, so make sure you understand them before you buy (using Google translate works fine for that)
Many times I didn’t buy from them in the end and went for the well known ones (like BBE, Builtin-Pro etc...) which are not the cheapest but at least no strings attached.
Anyway do your research!
And yes TV’s here are almost double the price than in the US or even Europe even though we live closer to the source.