Retail sales can be an essential component of the success of a spa. Here are some tips for improving retail sales in a spa:

• Train your staff: Train your spa staff to become knowledgeable about the products you offer. This will help them to be more confident in recommending products to clients and answering their questions.
• Offer product samples: Provide product samples to your clients so they can try before they buy. This will increase the likelihood of a sale and help build trust between your staff and clients
• Use displays: Create attractive displays that showcase your products and highlight their benefits. Use signs and graphics to draw attention to your displays and encourage clients to browse.
• Cross-sell and upsell: Train your staff to suggest complementary products or services to clients. For example, if a client is purchasing a facial, suggest a moisturizer or eye cream to go along with it.
• Run promotions: Offer discounts, special deals, or promotions on specific products to encourage sales. Promotions can also help introduce clients to new products or services.
• Follow up with clients: After a client makes a purchase, follow up with them to see how they are enjoying the product. This can help build long-term relationships with clients and encourage repeat business.
• Monitor inventory: Keep track of your inventory levels to ensure that you always have the products your clients want in stock. This will help you avoid losing sales due to out-of-stock items. You can also find a partner who will drop ship to your clients, which means you don't have to tie up funds on inventory and holding physical products. 

By implementing these tips, you can increase your retail sales and improve the overall success of your spa. In turn, your clients will appreciate the recommendations on how to best improve their skin at home and in-between treatments.