I don’t know how long this promo will last so you might want to jump on it.
Rakuten.com Coupons, Promo Codes & 10.0% Cash Back | Ebates
They do sell a fair amount of Pentax stuff from Adorama, Camera and others. Plus you get 1% back at Rakuten for future purposes.
You can get a sign up bonus if you are not already a member.
Disclaimer: I will admit they have a referral program (Ebates) that if you contact me for a referral we both get a bonus.
In any case, this can be a way to get what is effectively a discount on items that otherwise don’t get any less expensive.