I ordered via newegg, a NZXT case for my computer which was S$180, it seemed to be less than retail, and in Singapore it was $350 at the time. What was strange

I ordered via newegg, a NZXT case for my computer which was S$180, it seemed to be less than retail, and in Singapore it was $350 at the time. What was strange tho was other cases were listed for: S$2##.## Shipping... This 1 case was listed as free shipping. So I ordered it, was charged S$180, and 2 weeks later received a brand new, unopened, case, with glass panel all intact no issues.