One option is to send your image on disk to a slide-service bureau. Alternately you can take the negative to a Rite Aid or Kmart, which will send it to a Kodak lab. The cost is about the same as at drug and discount stores, but you'll be able to work more closely with whoever is doing the printing. Finally, you can have a print made directly from your computer file, which costs more but results in higher quality since fewer steps are involved. The most popular large-format printer used by service bureaus is the Encad NovaJet inkjet.
Larger formats are also available.
Inkjet ink smears and fades easily, so you should have the print laminated or lacquered, which costs extra. All rights reserved. Any copying, redistribution, or retransmission of any of the contents of this service without the express written consent of Philadelphia Newspapers Inc. is expressly prohibited.