I just looked they're going for 240 now
Where did you look? If it was a website that aggregates prices then those figures are always and have always been off. I looked as well and I also live within walking distance of almost 20 dispensaries. Most have online menus. The highest I found looking at four or five was $270 for guess what, Panama. Not some latest and greatest super dooper triple Silver berry sorbet Kush. Just straight Panama sativa. I also found Grape Crush $140, StarDawg OG $120, God bud $160, Strawberry Cough $210. Prices are all over the map. Many times there are specials so the price listed on the website could be completely wrong. I hear of half price specials frequently.
There are hundreds of dispensaries in Portland. Plenty of them have top shelf ounces for under $200. Prices are higher at some places but there are plenty of places with under $200 ounces.
I also think the term "Top Shelf" is rather vague. I've smoked weed that friends payed less than $100 an ounce for and I can guarantee it was probably better than what a good percentage of people on this site grow with their expensive lights and twenty bottles of overpriced nutrients. Top shelf is very subjective. I've gotten good and high off of $100 ounces that looked and tasted just fine. I don't buy from dispensaries because I grow my own but I know many people that have quit growing and now just head down to the dispensary because they don't want to hassle with growing and it's just as cheap for them to buy it.