Printing anything larger than A4 can cost a lot of money. Large format printers start at around 1,000 and rise steeply from there. There is an intermediary path though. If but don't need A2 or bigger and only want to go up to A3+ - A3 prints with full bleed then Epson's Stylus Photo R2400 is a versatile medium format machine. It can handle sheet, roll and thick media of up to 1.3mm, which makes it suitable for small signage.