It looks like maybe a drop shipper company. I can't find anything about them anywhere else in the internet, which is weird if they have actually been in business for 10 years.
However,
Their phone number brings up another website:
Shop our wide choice of business supplies, from furniture & office equipment to office stationery, and more. Office Supply Source offers the variety of office goods from top brands at cheap prices.
www.officesupplysource.com
Both are owned by S3 Stores inc, which has a bunch of store fronts.
Buy the best-known brands at S3 Stores, Inc. More than 15 online shopping stores. Art, craft, teacher, health care supplies, pet products, furniture, etc.
www.s3stores.com
Facebook and phone number places them in Michigan, but their website profile puts them in Canada.
Social media hasn't been updated in a few years.
It seems like maybe it's legit, but it's also kinda suspicious. It might be fine but I personally wouldn't trust it.