for my Hubbies 50th, I borrowed extra tables, and bought length of material for a tablecloth, and did a 3 course meal, including Roast Beef and yorkshire puds, for 23! I bought most things at Costco- they also do good deli platters.
I can never fault Publix deli either.
Or why not make meat and potato pie, chilli and curry, and make it more casual- I would defintely get a publix or Costco Cake.