"Handheld Bookworm game" isn't a specific product—it likely refers to the word puzzle game Bookworm (form words from falling letter tiles to feed Lex the Bookworm), originally by PopCap.
Where to Look
Online Retailers: Amazon, eBay, Etsy — search "Bookworm game" for vintage dedicated handhelds (Tiger Electronics, Radica) or mobile versions.
Retro Game Stores: May have old dedicated handheld units (1990s–2000s LCD games).
Thrift Stores / Flea Markets: Occasional finds in electronics/toys sections.
Modern Versions (Easier to Find)
Mobile Apps: Search "Bookworm" on App Store (iOS) or Google Play (Android). PopCap's version may be delisted; clones exist.
Web Versions: Free browser-based clones on sites like Pogo, MSN Games, or HTML5 ports.
PC (Steam/Origin/EA App):Bookworm Adventures (RPG/word hybrid) and Bookworm Deluxe available digitally.