Reddit reviews Bulgarian-English, English-Bulgarian Practical Dictionary (Hippocrene Practical Dictionary)
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Used Book in Good Condition
Well, you could try reading old folktale books, they have a very colorful and fun style of writing, tho Im not sure how many have good translations.
I do know a few good step by step books. Here are links to some.
https://www.linguajunkie.com/bulgarian/best-bulgarian-textbooks
https://www.europeanbookshop.com/languagebooks/series/BUL/m1/c3/6/COBU
Getting a Dutch-Bulgarian/English-Bulgarian Dictionary is also quite useful, these are relatively common.
https://www.amazon.co.uk/Bulgarian-English-English-Bulgarian-Dictionary-Hippocrene-Dictionaries/dp/0870521454
I hope some of this is useful to you and good luck!