Inexpensive macro lens for nikon d80?

Upgraded to digital lately but my lens now are a bit distorted. So I'm looking for a good basic lens for walking about where I won't have to be switching lenses constantly (already have a telephoto). I'm leaning towards f/2.8 for a cleaner picture and a tameron because I'm on a budget.

This will depend on your idea of inexpensive but an F2.8 lens that is good for walking around is not going to be cheap. Also a macro lens is a fixed focal length lens. Generally either 50 or 100mm. While they are fine for most other things they don't zoom and a designed for macro work. These are not cheap either.

Nikon 105mm F2.8 micro $890
Nikon 60mm F2.8 Micro $460

Sigma 105mm F2.8 macro $730
Tamron 90mm F2.8 macro $460

I think you may have the term "macro" confused. Macro lenses are prime, flat field lenses used for shooting images at image to subject ratios of 1:1, 1:2, 1:3 and 1:4 as well as used as a normal lens when shooting out to infinity.

A good used Nikkor AF 55 mm f/2.8 or AF 60 mm f/2.8 lens will fit that category.

I found some AI 55 mm f/3.5 macro lenses for under $150. Since all macro photography is usually shot in the manual focus mode in any case, buying a manual focus lens is not going to be a big deal. If auto-focus is still a priority for you, I found a 60 mm f/2.8 lens for under $400.

Look on craigslist in a city near you or on Adorama or B&H Photo websites for used lenses.

On the other hand, if you want just one "walk-around" lens, the 18-200 mm VR is that lens, but you will not be able to shoot closeups.

You really need to decide which you need, a macro or wide range zoom lens.

Now to the f/2.8 issue.

There are two lenses that you may like to use, but neither are inexpensive. The 24-70 mm f/2.8 and 70-200 mm f/2.8. Since you already have a telephoto, my guess is that the 24-70 f/2.8 will be more to your liking if you can fit it in your budget

I would consider Nikon 60mm f/2.8D AF Micro-Nikkor Lens for Nikon Digital SLR Cameras

Nikon's most compact Micro lens for close-up and general photography
Close Range Correction system provides high performance at both near and far focusing distances
Nikon Super Integrated Coating for minimized flare and ghost, providing good color balance
Close-up to approximately 8.75 inches
90.4-millimeter working distance