Realtor - For Comps Only

[Brian G.]

I have one realtor I've been using for comps so far. When I have asked for comps it has sometimes taken a day or more to get them. I was told by another investor I should be getting comps within 15 minutes. Most of the comps I've needed have been on non listed homes (estates). So, the question is, how can I get a realtor to give me comps quick when they have no upside to doing it? Do you offer to pay them on a closed deal?

Brian