Systems and methods are described for adjusting an item characteristic. An illustrative system includes a first network interface, a database storing information regarding a plurality of items, a load balancer, a web proxy processor configured to selectively block or route an inbound user browser request, a cache cluster system configured to cache data and states for access by other system components, and program code stored in computer readable memory, which, when executed is configured to receive a plurality of requests for items from corresponding users, wherein the plurality of requests are associated with corresponding offer amounts and determine what the users are to provide for the items based at least in part on how many requests were received, how many items are allocated to users, and/or how many unallocated items are available, wherein at least a portion of the users are to provide an amount different than their corresponding offer amount.