Like you said, $20. Upper-end of average, but still average. And you'll always pay more for 180-gram. But I'll be all over that Vheissu repress too. Hopefully it's slightly better quality than the AITA repress.
It really depends on the artist, press quality, packaging, run, etc. You're talking middle of the road vinyl; this pressing is just slightly north of that, and you can't fault them for charging more on 180-gram.
i realize 180g will usually cost more. regardless, i bought the lost boys version of rufio yesterday for $20 shipped and it comes with two bonus 7"; thrice vheissu 2xlp is coming out for around $25 shipped (and thats because HT bones you a bit on shipping). this preorder doesn't even say what kind of jacket, if there's an insert, etc. they also want $5 for shipping.