Is $1,500 to remove rats from crawlspace insulation and seal entry points a fair price?

I have rats in my crawlspace insulation, and they’ve also made the vapor barrier disgusting. The crawlspace is about 600 sqft. I’ve gotten several quotes, with most ranging between $5,000 and $7,000. However, I received one quote for $1,500. They claim to be licensed, bonded, and insured, and have good online reviews. I'm wondering if there's any reason I should be wary of this cheaper bid, as it's super tempting. Over the phone, the contractor said the $1,500 quote includes removing the old materials and sealing the ratways, but I plan to ask for a detailed breakdown.