Cheapest alternatives for HB (forget accuracy) is
a) Hasbro Titan series - though I don't see them around anymore
b) Lego

I did some googling last time, and the cheapest movie accurate Hulkbuster is the statue from Kotobukiya, which is around RM 5XX I think.
The next one would be the Marvel Legends BAF Hulkbuster, which all 7 figures cost RM 6XX, where you get the HB and 7 other figurines. It's not to scale to anything as far as I know nor as accurate as the statue from Kotobukiya, but its at least a little articulated
Then there is the S.H. Figuarts HB, while it looks impressive and quite accurate, this hits the RM 1k+ range already. I think some local shops had it at PO between RM 1300 - RM 1600
Saw the King Arts HB on TFH, but not too familiar with the quality of their figures, so I can't judge it.
Then there is the HT's HB. At the time shops were taking PO for around RM 2.8k, EXCLUDING GST. Take into account our weakening exchange rate, I think this may enter the RM 3k+ range by the time it arrives.
Even the 1/12 Bat Deluxe which I ordered from HT was already RM 2.2k when I first ordered it. I am a little worried how much it will cost by the time it arrives (GST + FOREX)
I also PO the HT hulkbuster. I thought when we pre order the item it mean we "lock" the price already. We still pay the same price when pre order (as agreed) even by then the exchange rate of RM is lower? the shop can't ask us to top up due to the different of exchange rate. Correct me if i'm wrong.