Out of the three options you mentioned - conventional, airless, and HVLP (high volume, low pressure) sprayers - conventional sprayers are typically the most affordable option. However, they can be more challenging to use compared to HVLP sprayers and they often result in more overspray and waste.

If you are looking for an affordable option that is still effective, you may want to consider an airless sprayer. Airless sprayers are typically more affordable than HVLP sprayers, and they are known for their efficiency and speed, making them a good choice for large painting projects.

However, it's important to keep in mind that airless sprayers can be more difficult to control compared to HVLP sprayers, and they can result in more overspray, drips, and waste. Additionally, airless sprayers can be more physically demanding to use, as they require a higher level of pressure and require you to hold the sprayer for extended periods of time.

Ultimately, the best option for you will depend on your budget, your painting experience, and the type and size of your painting project.
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