Welcome to Cheftalk Nicia.
If I may ask, are you an actual licensed caterer at this point?
Regardless, 4.00 x 30 is 120.00. Is there any part of you that even remotely considers this a reasonable offer?
Though you didnt mention how MANY different selections they want, i dont see how this could even cover your food cost, let alone other costs, labor and profit.
It continues to amaze me how potential clients think they can name their desired budget and expect the caterer to comply. If they walked into Best buy, selected a 1500.00 refrigerator and told the sales person "I only want to spend 400.00 though. But I'll give you plenty of referrals", would that be realistic?
In catering, as anything else, it doesnt work that way. A client approaches a carerer in one of 2 ways.... they say what they want and get a price proposal, or they name a budget and get a service proposal for that amount.
In this case I wouldnt even bother writing a proposal for that amount--not even worth the shopping trip for even one appetizer for 30. My absolute minimum on anything is 350.00, and thats a simple drop off for 30 and not very far away. If theyre offering that little, they likely wont be open to any reasonable proposal. I would therefore tell them no thank you.
If I were you.