Waste of money. 350.00 one time maybe. SEO is like fortune telling - if it works they take credit for it, if it doesn't they blame Google for changing the game on them - either way you still pay. Good SEO is part of the site design. Google give weight to all kinds of things like how long has your site been around, backlinks, etc. Since you're not really looking for consumer business from India and Belarus, even more reason to not drop 4K plus a year. Just make sure your site is linked in to your professional organizations and associations, and trade links with your customers, suppliers, vendors, etc.
I did a website for a buddy of mine that owns a public warehouse here in Dallas back in 2005. He stays on page 1 of google for his target terms and we haven't touched that site in 5 years - although we're finally looking at an upgrade this year.