Residents are hoping to raise £25,000 to fight plans to build a Tesco supermarket in a Surrey village.
The Save Ashtead Village Environment campaign will use the funds to pay for a planning expert and a solicitor.
Mole Valley District Council narrowly turned down Tesco's proposal in February to build the store in Ashtead.
Tesco wants to build on the site of a former petrol station in The Street and has lodged an appeal with the planning inspectorate.
The residents argue the store would be out of keeping with the village atmosphere and potentially harm local businesses.
Campaigner Gillian Russell said: "More than 6,000 people signed both of our petitions so the level of opposition is overwhelming.
"We are confident that the people of Ashtead will unite to give generously to help save our wonderful village - but we must all act quickly, as time is short"
In a report to the planning committee in February Tesco said the scheme was "well thought through" and "exactly what Ashtead required."