Buying Large Dealer Promo Model Collections - $1,500

DO you have or do you know someone who has built up a super large collection of dealer promo model cars over the years and is now ready to sell? I am looking to purchase those collections form the 1950-1980s promo cars and model kits.
Looking to buy as one collection and will pay very fairly! Let me know what you have--looking forward to hearing from you!