You can get nicely printed stationery in Singapore from the many book shops and shopping centres however, monogram stationery is something else. Most professional printers cater to corporations and I think the only time we use this service is to print wedding invitations, remember the lengthy design time you spent with the printing house designers.
Vistaprint.sg is a photo shop and professional printer all in one. You can print small quantities of personalized stationery for home use very affordably from S$13 for 1 personalized notepad of 50 sheets. You can print the full range of stationery here from sticky notepads to envelope stickers. It's friendly website allows you to choose layouts online and upload the picture or photo you want printed and the finished product will be mailed to you.
Joli Monogram on Cozycot offers several letter set (letterhead and envelope) templates for you to choose from and each printed thick stock letter set starts from S$2.50 per piece, readily gift-boxed for your recipient. There is an option of pearlescent or thicker stock paper for S$0.50 more per piece. *10 Nov 2012 : Item has been moved to Minted a separate website.
Paper Tiger Press is one of many boutique Singapore presses. It offers a few select designs as well as customized orders of monogram or prints. If you are looking for high quality printing on informal stationery, this is the place. Pricing and ordering information unavailable, so I guess you have to send the owners an email.
If you are looking for bespoke service, Elephant & Coral does old-fashion engraved stationery. Call first for a consultation before heading down to one of their retail stores.
Singapore Post's MyStamp service allows you to order personalized stamps for regular home use or special occasions like weddings at just S$15.50 a sheet. Buy online or at a SAM kiosk.