Bing Ads Coupons or Accounts

Hello. I'm looking to buy bing ads coupons for old bing accounts. I have already used two coupons $48+$50). Also i am interesting in buy bing ads account with money in them. I can pay you 15%-25% of the cost of the coupon or the account. i am spending 2000 on bing ads every month just to have my website on first page of yahoo but now i am looking for ways to decrease the amount in to 700 per month. if you think you can help me please let me know. thank you.