Rubber mulch is gaining popularity in landscapes as an alternative material to woodchips for play areas and for landscape mulching. Rubber mulch has a higher absorption rate for playgrounds and a good life span when compared to wood mulch. There are some issues with the material, and its important to take into consideration the type of mulch being used. Not all mulches come from the same source and there are some concerns with toxicity of some recycled rubber products.
As with other alternatives like glass mulch, rubber mulch is going to cost 2-3x the cost of wood mulch, depending on the quantity installed.
The Cover Source, out of San Ramon is a good local reseller of rubber mulch that ships straight from the manufacturer is bulk quantites for landscape use.