I buy from a genuine barcode reseller - http://simplybarcodes.net/ who is into the business before I started my tshirt production business. We have never found any fault with their barcodes or their service.
I would suggest to give Washroom Mirrors with your logo and tagline of something like "We also care for cleanliness of your office". One advantage of it is anyone going to washroom will read this and he might contact you for his own home or office.
Blogging is the best way. If you have good writing skills and are uptodate about the latest news and trends in your industry you can use that to write a blog. Add adsense to your blog. Promote it on social networking site and Search Engines.
robots.txt file should be uploaded to your website rood directory and a valid sitemap.xml reference should be detected from it. This file is useful to search engine to know what pages are allowed to be crawled and what are not. Though it looks very small file it is very valuable for SEO.