Taihao has some pretty affordable sets. There's a gray one with lavender colored font which might look nice and not too flashy :)

https://www.aliexpress.com/item/taihao-pbt-double-shot-keycaps-for-diy-gaming-mechanical-keyboard-color-of-miami-diablo-black-orange/32818373202.html

It was also available on massdrop a few times as well if you wanted some reviews on it.
https://www.massdrop.com/buy/tai-hao-purple-pbt-doubleshot-keycap-set

It's suprising that the entry editions and any v2 nk65 are selling when there is a restock at the end of the month.

I'm also looking for purple keycaps so I gotchu. (Most of these are under $100 btw)

1. TaiHao - Mermaid Kiss Keycaps - 104 Keys - 1.75u R. Shift option - lavender and pastel yellow - oem profile - pbt material - $39

2. HK Gaming - Dye Sub PBT Muted - 139 keys - more layout config - white, light gray, muted purple - cherry profile - pbt material - best set for the price imo - $40

3. Geeksocial - Purple PBT Keycaps - 109 keys - no 1.75 R. Shift option - purple and purple on white with few red accents - cherry profile - pbt material - $50

4. NKPC - White Purple Mixed Thick PBT Keycaps - 108 keys - no layout config - purple and white but blank - oem profile - pbt material - $25 + $3 shipping

5. HFSECURITY - Pure White Purple Character Design - 132 keys (I think) - Different shift sizes - Just purple on white but design of keycaps is my fav - XDA profile - pbt material - lowkey sketchy (no reviews, questions, minimal description of product) - $57

6. Geekbro - Purple Tang Dynasty Keycaps - 113 Keys - Pretty sure theres a 1.75u shift - Dark purple and purple on white - OEM profile - PBT Material - nice keycaps if you don't mind the chinese text - $31

7. TaiHao - White and Purple keycaps - 104 Keys - 1.75u R. Shift option - White on purple modifiers (outside) and purple on white alphas (inside) - OEM Profile - ABS material - If you don't mind the ABS Material then I think this is what you're looking for - $25

8. Drop - Astrolokeys Keycaps - 104 Keys - I believe you can get nonstandard sizes of keys for $30 separately - Purple, white, yellow, pink with Purple on white alphas - DSA Profile - ABS Material - Excellent set but may be too expensive considering you may have to pay $30 extra for different size keys - $95 base set (104 keys) , $30 nonstandard key set

9. EnjoyPBT - Milk Purple Keycaps - 153 Keys - Lots of layout config - white on purple modifiers with purple on a cream like color alphas - Cherry profile - PBT Material - I really like the simplicity and color scheme of this keycap set - $89

10. Mechzone - Milk Purple Keycaps - 108 Keys - Not much layout config - kinda like the EnjoyPBT set I showed before but the cream color is more saturated and the purple is more like a lavendar - OEM Profile - PBT material - Not really into it - $50

11. Domikey - Gas Attack Keycaps - 159 Keys - Most configuration in the layouts so far - Not purple and white but white on dark purple modifiers and white on purple alphas with accents of yellow that can be included - SA Profile - ABS material - I only chose this because I wanted to include a variety of profiles for your personal taste - $92 for the 159 key set, ~$28 for base and modifier sets separately

That's basically all I could find for keycap sets but if you want some cool artisan purple keycaps I found this cute bubble hammer cat keycap and this rinnegan keycap.

I hope this helped, best of luck to you and have a good new year!