It's a rather small task and I would not mind if you sold it to others. Private message me for how much you will charge!
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Plus WHMCS have something like that also in the next version 4.51
The built-in WHMCS slider template is NOT the same as the one that Host Bill offers. WHMCS merely uses a slider for plan / package comparisons, you can't see how the price will escalate when changing package features like bandwidth, storage, IP's, etc.