I did a quick check in the market
So far I am seeing most 2nd hand shops selling the 8 Plus for about 600 SGD (440 USD) with only one month of shop's warranty while I am seeing a shop specialising in selling refurbs that sell the 8 for about 399 SGD (293 USD)
Meanwhile to repair my iPad Pro screen at 3rd party places, it will take from 300 SGD to 800 SGD (220 USD to 588 USD) depend on the cause and severity of the issue. Right now parts are out of stock but once they are restocked, it will take a day at most to swap the parts
Should I go for these, or do I go for the online shops you all have mentioned here? Note that I do not have a hard deadline for this; waiting is an option (though I can see that the faster I get the raw/field test data, the better I can decide)