Rookie value in a rookie superflex auction league

I am in an interesting league where one spot on your team is a rookie super flex spot. It is also a 10 man auction league with a 300$ salary. You’re leftover salary rolls over as your faab for the year so you have the option of blowing all your faab during the auction or saving it for the waiver wire later. What do you all think rookies would be worth this year in that format as there’s only 4-5 high tier rookies available and a sharp drop off after.