you won't, cheaply anyway, stalk myfigurecollections every day (make a bookmark for searching "pokemon" on ads page) and hope for them to be under $200, check yahoo auctions jpn but you'll have to use proxy,
https://picclick.com/?q=kotobukiya+pokemon is a descent congregate of a couple sites but desu it hasn't found anything decent price in ages the figures are getting more rare and the price is going up, serena used to be easily findable at $90 a year ago but not any more.
I completed the set (not including males/lillie+clefairy dupe since i have the cosmog one) and the last few had to get around 170 and selene and rosa where like 250, if you wanna complete the set its gonna be costly or a lot of waiting
