Your logo in any format, rough headcount, the garments you have in mind or a description of the work, and any deadline. That is enough for a real price rather than a range.
The single biggest thing that speeds up a quote is a clear headcount by size, not just a total. 'Twelve people' takes longer to price accurately than 'four small, five medium, three large' — the second gets you a real number on the first reply instead of a follow-up question.
The questions are free. So is the quote.