These are a popular yet somewhat overtraded item , you get many types of hardware and the graphics are generally digitally printed on various substrates , we print on one way mesh , tyvek , polyprop , backlit etc and market an expensive roll up system with a carry bag. An 800mm x 2.2m goes for about GBP 150 or so.
To answer another question , you can use thin banner and vinyl but the roll up actions and thus vinyl wrinkling and the rolled thicknesses (cant fit in some housings) tend to steer people away from this.
Due to constant handling and roll up , one mostly laminates these type graphics no matter how they are printed.
You will find that most digital printers will have a line of these and will offer a finished product and if you are buying in and reselling , it might be a little difficult to make good money on them , but thats dependant on who around you is selling them.
There is a point you make about what a signmaker is offering.
Ultimately , a signmaker is there to increase his customers profits , no one will pay good money for any product we offer unless it has that effect. Generally the problem with signage is that it has an indirect effect on profit , it cant really be measured in immediate results. The signmaker has to use his craft to provide information , recognition , brand awarness , publicity etc etc to achieve this for the customer.
For example , lets say you are kitting out a fast food store , apart from window , vehicle and storefront signage , there are other opportunities like lightboxes with backlit digital photos , photo menus , wall display units , free standing “special” displays , banners , table top displays , brochure/menu holders and so on.
All of these fall within a signmakers brief and to provide better service to the customer , could be offered by you. In tems of advantage to the customer , it means there is one supplier to deal with and the whole campaign can be integrated around standard design and artwork formats etc etc.
A lot of these “add ons” are ongoing projects , where signage really isnt , it’s normally a one off job. With promotional signage menu’s change , specials change and so on , so by getting into this are you get lots of jobs instead of one and due to your relationship with the customer , it could develop into something big if the Co takes off and opens 10 more branches.
Exhibition signage is very good business , folk are prepared to spend (the clever ones) as in exhibitions , impression is everything and people pay to have graphics or signage that stands out from the crowd. Once again , the signmaker should offer to do it all , if you can.