I'm entering as an individual, but for the company information I am entering the place where I work. There would be no affiliation between this contest award and my employer. I hope my employer is not being considered a factor as that would likely be a detriment to my chance of winning. It's a required field so I felt better using a real company rather than making one up...
I'd gladly pay whatever tax is due as I'm probably going to buy a decent power supply, eventually... There is no dumpster dives where I am. Hard to buy anything at all for a deal around here as everyone has money and snaps everything up and relists it on ebay or CL for a ransom.
I think the UK, would add VAT, at 20% of the total maximum list price + delivery charges, plus a percentage for import duties (depends on what is bought, and how much). Which, came to about £350 for it, from memory. Which is approaching $500.
To put it another way. If I was to win a competition. I would want to get the item for "free", and not have to pay huge tax/duties/VAT for it. E.g. Get Keysight UK** (**substitute applicable country of residence here) to give the winner the item, then I believe it would be "free".
EDIT:
I forgot to say, but the delivery company, can add on big charges as well, if there are charges to be made. So it can come to a worrying amount.
E.g. for cheaper items, the delivery charges on top of the normal charge, so that they can perform the customs charge, can be as high or even bigger, than those charges. I.e. for some things it can cost +50% more, on top of the purchase price. For expensive items like this threads PSU, it is probably an extra percentage of the total of about 6% to 12% + £20 or something like that.
These various add ons, can add up to a rather unpleasant surprise. Easily doubling the charges, for cheaper items. So £15, costs £30 total, etc.