enigmatic puzzle – Discover the lacking gadgets on this receipt

The thematic reply phrase is:

COSTS

The 5 shops every inventory six of the gadgets from the listing (5 named, one title lacking) and have the next pricing guidelines (I’ve numbered them 1 to five to match the ordering of which of them inventory the primary 5 gadgets on the receipt)…

Retailer 1:

All gadgets include hidden numbers spelled out, that are then concatenated to kind the value:

STONE WEIGHTS $18 (ONE, EIGHT)
HBO NETWORK $12 (ONE, TWO)
LOUIS IX‘S THRONE $61 (SIX, ONE)
HONEST WORKER $12 (ONE, TWO)
“DAYS OF OUR LIVES” EVENINGWEAR $47 (FOUR, SEVEN)

The lacking merchandise costing $91 is:

CANINE CELL PHONE (NINE, ONE)

Retailer 2:

All gadgets are priced in keeping with the sum of the Roman numerals used within the spelling of their title (M=1000, D=500, C=100, L=50, X=10, V=5, I=1):

“THE MATRIX DVD” $2,016 = M + D + D + X + V + I = 1000 + 500 + 500 + 10 + 5 + 1
TIMID CELLISTS $1,703 = M + D + C + L + L + I + I + I = 1000 + 500 + 100 + 50 + 50 + 1 + 1 + 1
“MAXIM” MAGAZINE $3,012 = M + M + M + X + I + I = 1000 + 1000 + 1000 + 10 + 1 + 1
CINEMAX $1,111 = M + C + X + I = 1000 + 100 + 10 + 1
SKIM MILOkay $2,052 = M + M + L + I + I = 1000 + 1000 + 50 + 1 + 1

The lacking merchandise costing $512 is:

OXIDIZER = D + X + I + I = 500 + 10 + 1 + 1

Retailer 3:

This retailer shares gadgets with synonyms that differ from a quantity by a single letter – this quantity then turns into the merchandise’s value:

EMERY BOARD $5 : FI(L)E → FIVE
NUANCE $90 : NI(C)ETY → NINETY
FLUNG $3 : THRE(W) → THREE
NEATO $50 : (N)IFTY → FIFTY
LAMP $8 : (L)IGHT → EIGHT

The lacking merchandise costing $40 is:

STRENGTH : FORT(E) → FORTY

Retailer 4:

This stuff are all anagrams of their costs when the numbers are spelled out:

“NIX” TEE SHIRT $613 = SIX-THIRTEEN*
FORTUNE $410 = FOUR-TEN*
THE HINDU TAFFY STORE $3,050 = THREE-THOUSAND-FIFTY*
A TENNIS HOUND $9,000 = NINE-THOUSAND*
EVERYTHING OF USE $784 = SEVEN-EIGHTY-FOUR*

The lacking merchandise costing $48 is:

TOY FIGHTER = FORTY-EIGHT*

Retailer 5:

On this retailer, depend up the vowels and consonants within the merchandise’s title – the overall variety of vowels turns into the tens unit of the value, whereas the overall variety of consonants turns into those unit:

LATCHSTRING $29 = 2 vowels (bolded), 9 consonants
KNICK-KNACKS $29 = 2 vowels (bolded), 9 consonants
AUDIO TAPE $63 = 6 vowels (bolded), 3 consonants
“PDQ BACH” CD $18 = 1 vowel (bolded), 8 consonants
HAWAII‘S MAUNA LOA $96 = 9 vowels (bolded), 6 consonants

The lacking merchandise costing $17 is:

STRENGTH = 1 vowel (bolded), 7 consonants

(Notice that this merchandise can also be what was stocked in Retailer 3 – however there’s nothing within the guidelines of the puzzle to say that every lacking merchandise should be distinctive…)

Placing this all collectively, we’ve got our 5 lacking gadgets:

CANINE CELL PHONE
OXIDIZER
STRENGTH
TOY FIGHTER
STRENGTH (once more)

The primary letters of those phrases on this order spell COSTS – our reply phrase, and what this puzzle has all been about!